Technical Data TD157003EN
Effective August 2015
Supersedes November 2013


Electronic voltage regulator (EVR)
Contents
DescriptionPage
General description . . . . . . . . . . . . . . . . . . . . . . . 2
EVR benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Industry standards and certifications . . . . . . . . . . 3
Theory of operation. . . . . . . . . . . . . . . . . . . . . . . . 4
Product selection. . . . . . . . . . . . . . . . . . . . . . . . . . 4
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Component diagrams . . . . . . . . . . . . . . . . . . . . . . 6
Control board. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Technical diagrams . . . . . . . . . . . . . . . . . . . . . . . 17
Cabinet dimensions. . . . . . . . . . . . . . . . . . . . . . . 30
Manual bypass switch. . . . . . . . . . . . . . . . . . . . . 30
Normal mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Bypass mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Standard monitoring . . . . . . . . . . . . . . . . . . . . . . 30
Metering option. . . . . . . . . . . . . . . . . . . . . . . . . . 30
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Technical Data TD157003EN
Electronic voltage regulator (EVR)


Effective August 2015
IMPORTANT
Save these instructions. Please read this manual before using
equipment.
General description
The electronic voltage regulator (EVR) is a continuous duty
electronic voltage regulator designed to supply reliable, clean
regulated power to critical loads. An efficient design with stateof-the-art microprocessor controlled solid-state devices provide
immunity to all line disturbances.
The basic design consists of a three-phase triple-shielded isolation
transformer with seven separate voltage taps per phase. Output
regulation is achieved by monitoring the input and automatically
switching taps anytime the input line sags or surges. The special
process of triple-shielded isolation transformers provide superior
common mode and transverse mode noise attenuation. Automatic
switching occurs during current zero, allowing noise-free switches
for both leading and lagging power factor loads that are connected
to the EVR.
Monitoring
Monitoring of the EVR is simple, clean, and effective. Three green
light indicators are used to display “POWER ON” (output line to
neutral for each phase) and one red light indicator to display “ALERT.”
The “POWER ON” display is connected directly to the output that
indicates the EVR is operating properly with just a quick glance. The
“ALERT” display represents an overtemp problem when illuminated
and will shut down the output, but cooling fans remain on. Overtemp
thermal sensors are strategically located at critical points on the regulator assemblies and transformer. The main AC input circuit breaker
must be turned off in order to reset the “ALERT” light.
Protection
Protection is accomplished very effectively to minimize failures and
the cost of repairs. A total of four major devices protect the EVR.
1.
The input is protected with an integrally mounted AC circuit
breaker for abnormal current overloads and provides a
convenient means of disconnecting utility power.
2.
The electronic regulating devices are protected with fast-acting
semi-conductor fuses. These fuses are designed to clear before
damage occurs to the more expensive SCR regulating devices.
The main transformer is protected by fuse links connecting
the SCR regulators together, and are designed to clear in the
event that two or more SCRs should fail. This will prevent a
transformer tap short and the possibility of transformer failure.
3.
Overtemp sensing devices are mounted at critical points on the
SCR regulating assembly and the main transformer. When an
overtemp condition exists, the “ALERT” light will illuminate and
hold until the overtemp is corrected. There are no automatic
shutoff circuits for the “ALERT” condition. The main AC input
breaker must be turned off in order to reset the “ALERT” light.
4.
Optional dedicated surge protective device can be installed
internally if requested at time of order. This surge suppression
device (SPD) is a CVX 50 kA SPD for EVR units 50 kVA and
below, and CVX 100 kA SPD for EVR units 75 kVA and above.
This unit provides effective transient voltage surge suppression
and will help to prolong the life of the EVR.
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Operation
The EVR is operated by simply turning on the main AC input circuit
breaker. All units 50 kVA and larger are equipped with a bypass
switch as a standard feature. For units 45 kVA and smaller, the
bypass switch is optional. This is a no load switch and MUST only be
operated when the unit is OFF. The bypass switch should be in the
“NORMAL” position unless a problem occurs with the system. If a
problem occurs, turn OFF the main AC circuit breaker and turn the
bypass switch to the “BYPASS” position. Re-energize the system by
turning on the AC circuit breaker and contact the Customer Support
Department for repairs.
Any “ALERT” condition requires the main AC input breaker to be
turned off in order to reset the “ALERT” light.
For assistance, call 1-800-809-2772, option 4, then option 2.
EVR benefits
•
Line harmonic filtering
•
Small physical size
•
Simple and inexpensive installation
•
Highly efficient
•
Quiet operation
•
Low BTU output
•
Low failure rate
•
Seven-tap, microprocessor control and diagnostics
•
UL® Listed to 1012 standards
•
Affordable
•
Conservatively rated
•
Extremely high surge capability
•
Simple operation
•
Input electronic circuit breakers
•
Nationwide customer support service
Technical Data TD157003EN
Electronic voltage regulator (EVR)
Effective August 2015
Specifications
Main transformer
Technical
•
Windings: all copper
•
Magnetics: grain orientated, M6 grade, stress-relieved transformer
steel is used for minimum losses and maximum efficiency
•
Insulation: Class (N) 200, all sizes
•
Shielding: multiple triple copper shield to minimize interwinding
capacitance, transient, and noise coupling between primary and
secondary windings
•
Dynamic electrical specifications
•
Output: maintained to within ±3% of nominal
•
Input: +10% to –23% of the nominal rated input
•
Frequency: 60 Hz ±3 Hz
•
Input power factor: >0 .99 PF with resistive load
•
Line regulation: output is ±3% of nominal for input variations of
+10% to –23% of nominal
•
Cooling: convection, operating temperature is 130ºC maximum
rise above ambient
•
Load regulation: output maintained within 3% from no load
to full load
•
Isolation: output is fully isolated from input
•
Response time: <1/2 cycle
•
Correction time: output will correct to within ±3% of nominal in
1 .5 cycles or less
•
Harmonic distortion: Less than 1 .0% THD added to the output
waveform under any dynamic linear loading conditions presented
to the line regulator
a
a
a
•
Transverse-mode noise attenuation: 3 dB down at 1000 Hz, 40 dB/
decade to below 50 dB with resistive load
•
Common-mode noise attenuation: 146 dB
•
Audible noise: 45 dB or less
•
Turn on characteristics: when energized, voltage overshoot will be
less than 5% of nominal for 1 cycle or less
•
•
•
Cabinet
Heavy-gauge industrial steel throughout . Metal is anti-corrosive
phosphate treated prior to paint . Paint is a baked finish .
Input breaker
Main input molded-case circuit breaker, rated at 125% of full load
input current .
Industry standards and certifications
•
ANSI/IEEE® C57 .12 .91 Transformer Test Code
•
ANSI C62 .41 Category B-3
•
NFPA 70—National Electrical Code®
Overload rating: 1000% for 1 cycle and 200% for 10 seconds
•
FCC Class A limits, 47 C .F .R . Part 15, Subparts A, B
Ambient rating: –10º to +40º Celsius
•
UL Listed to standard 1012, power supplies—general purpose
Integral manual rotary maintenance bypass switch standard on
50 to 500 kVA units and optional on smaller units
•
cUL® Listed to CSA standard C22 .2, No . 107 .1-01
•
NEMA® PE 1 (National Electrical Manufacturers Association)
•
NEMA 250 (National Electrical Manufacturers Association)
•
Enclosures for Electrical Equipment (1000 V maximum)
•
ISO® 9001:2008
•
Occupational Safety & Health Administration (OSHA)
Notee: 50 Hz models available .
Figure 1. Regulation graphs
a Optional extended input regulation range provided on some units.
If provided, reference the description next to the unit’s specification tag.
 Between 160 V and 229 V at 208 V nominal. Between 369 V and 528 V at 480 V nominal.
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Technical Data TD157003EN
Electronic voltage regulator (EVR)


Effective August 2015
Theory of operation
The EVR provides the triple function of isolation, noise attenuation,
and voltage regulation. The first two functions are provided by the
power transformer, where as the third function of voltage regulation
is achieved through solid-state thyristors (SCRs) connected to taps
on the power transformer. A microprocessor monitors and controls
the overall function of regulating the system.
The power transformer is manufactured with a unique method of
shielding that produces very low capacitive coupling between
the primary and secondary. This low coupling provides excellent
attenuation of the common-mode noise. In addition, special care is
taken in the design of the transformer to attenuate transverse-mode
noise above 1000 Hz.
The power transformer has taps to which solid-state switches
(SCRs) are connected.
The voltage regulator incorporated in the EVR is microprocessor controlled to achieve optimum correction time of input voltage sags and
surges. The response time is typically one half (1/2) cycle for 100%
correction, therefore, a very smooth switch takes place undetected
by computer equipment.
As the input voltage (building power) varies, the voltage available at
each tap of the transformer will also change. The amount of variation
is dependent upon the input sag or surge, turns ratio, and
transformer losses.
By selecting a particular tap voltage, the output can be kept within a
tight range. The way in which this is accomplished is that an electronic
control card using a microprocessor continually monitors the input
voltage. When a voltage fluctuation occurs, which exceeds the limit
of rated regulation (typically ±3%), the output is switched to another
tap that is within the required range. This “switch” will be made at the
next current zero crossing to allow for both leading and lagging power
loads to be connected to the conditioner.
Product selection
Table 4. EVR model selection guide
EVR XXX XXXX XXXX X X XX X
kVA Ratings and Dimensions
kVA
Weight
(lbs)
BTUs/
hr
Bypass
Cabinet Size
Metering Dimensions H x W x D in Inches (mm)
010
010
015
015
025
030
045
050
075
100
125
150
225
300
500
440
520
465
700
700
720
950
1,176
1,575
2,014
2,137
2,240
3,300
4,000
5,500
1,025
1,205
1,540
1,540
2,560
3,090
4,600
7,332
9,514
11,833
14,748
17,698
23,000
30,750
51,250
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
30.20 x 22.20 x 29.00 (767.1 x 563.9 x 736.6)
44.20 x 22.20 x 29.00 (1122.7 x 563.9 x 736.6)
30.20 x 22.20 x 29.00 (767.1 x 563.9 x 736.6)
44.20 x 22.20 x 29.00 (1122.7 x 563.9 x 736.6)
44.20 x 22.20 x 29.00 (1122.7 x 563.9 x 736.6)
44.20 x 22.20 x 29.00 (1122.7 x 563.9 x 736.6)
44.30 x 45.90 x 29.00 (1125.2 x 1165.9 x 736.6)
66.00 x 29.00 x 35.50 (1676.4 x 736.6 x 901.7)
76.00 x 34.40 x 35.50 (1930.4 x 873.8 x 901.7)
76.00 x 34.40 x 35.50 (1930.4 x 873.8 x 901.7)
76.00 x 34.40 x 35.50 (1930.4 x 873.8 x 901.7)
76.00 x 34.40 x 35.50 (1930.4 x 873.8 x 901.7)
77.40 x 56.00 x 41.50 (1966.0 x 1422.4 x 1054.1)
77.40 x 56.00 x 41.50 (1966.0 x 1422.4 x 1054.1)
77.00 x 72.40 x 48.40 (1955.8 x 1839.0 x 1229.4)
Options
B =Bypass switch a
M1=Standard metering (IQ 130)
M2=Premium metering (IQ 150)
Nominal Input Voltage
Delta Input: L, L, L, G
208D = 208
240D = 240
400D = 400
480D = 480
600D = 600
Nominal Output Voltage
Wye Output: L, L, L, N, G
Surge Protection
X = No
S = Yes
Frequency
A = 60 Hz
B = 50 Hz
208Y = 120/208
400Y = 230/400
480Y = 277/480
600Y = 347/600
a Bypass is standard on 50 kVA and larger units and an option on 45 kVA and smaller units. The ‘B’ is not included in the part number for units 50 kVA and larger.
Notes
Listings—UL Listed, CSA Certified, except for 600 V: no UL, CSA on 600 V units.
For output distribution, call factory.
K factor–rated units available on request.
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Technical Data TD157003EN
Electronic voltage regulator (EVR)

Effective August 2015

Technical data
Table 1. Nominal input current at various input voltages
Model
kVA
size
10
15
25
30
45
50
75
100
125
150
225
300
500
Input voltage
208 V
208 V Input
breaker size
240 V
240 V Input
breaker size
400 V
400 V Input
breaker size
480 V
480 V Input
breaker size
600 V
600 V Input
breaker size
29 A
44 A
73 A
87 A
131 A
146 A
219 A
291 A
364 A
437 A
656 A
875 A
1457 A
40 A
60 A
11 A
110 A
175 A
175 A
300 A
400 A
450 A
600 A
800 A
1200 A
2000 A
25 A
38 A
63 A
76 A
114 A
126 A
189 A
253 A
316 A
379 A
568 A
758 A
1263 A
35 A
50 A
100 A
100 A
150 A
150 A
250 A
350 A
400 A
500 A
800 A
1000 A
1600 A
16 A
23 A
38 A
45 A
72 A
76 A
112 A
157 A
189 A
227 A
341 A
455 A
758 A
20 A
30 A
60 A
60 A
90 A
100 A
150 A
200 A
250 A
300 A
450 A
600 A
1000 A
13 A
19 A
32 A
38 A
57 A
63 A
95 A
126 A
158 A
189 A
284 A
379 A
631 A
20 A
25 A
50 A
50 A
80 A
80 A
125 A
175 A
200 A
250 A
350 A
500 A
800 A
10 A
15 A
25 A
30 A
46 A
51 A
76 A
101 A
126 A
152 A
227 A
303 A
505 A
15 A
20 A
40 A
40 A
60 A
70 A
100 A
150 A
175 A
200 A
300 A
400 A
700 A
Table 2. Nominal output current at various output voltages
Model
kVA
size
Input voltage
208/120 V
480/277 V
10
15
25
30
45
50
75
100
125
150
225
300
500
28 A
42 A
69 A
83 A
125 A
139 A
208 A
278 A
347 A
416 A
625 A
833 A
1388 A
12 A
18 A
30 A
36 A
54 A
60 A
90 A
120 A
150 A
180 A
271 A
361 A
602 A
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Technical Data TD157003EN
Effective August 2015
Component diagrams
10–15 kVA, 60 Hz, All input voltages
10–15 kVA, 50 Hz, All Input Voltages and 25–30 kVA, 60 Hz, All Input Voltages
Figure 2. Unit
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Electronic voltage regulator (EVR)


Electronic voltage regulator (EVR)

Technical Data TD157003EN
Effective August 2015

Figure 3. Unit component location diagram (45–150 kVA, 60 Hz / 30–100 kVA, 50 Hz)
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Technical Data TD157003EN
Effective August 2015
Figure 4. EVR 50K component location
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Electronic voltage regulator (EVR)
Electronic voltage regulator (EVR)
Technical Data TD157003EN
Effective August 2015
Figure 5. EVR 75–150K component location
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9
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Figure 6. Unit component location diagram (225–300 kVA 50/60 Hz, all voltages)
Left Side View
Control
Card
Power
Supply
Card
Heatsink
Assembly
Cooling Fan
Heatsink
Assembly
With Snubber
Card
Front View
Output Terminals
Input
Breaker &
Optional
Bypass
Cabinet Cooling Fan
Right Side View
Multi Shielded
Isolation
Transformer
Output
SemiConductor
Fuses
Output Filtering
Rear View
Technical Data TD157003EN
Effective August 2015
Electronic voltage regulator (EVR)


Electronic voltage regulator (EVR)

Technical Data TD157003EN
Effective August 2015

Figure 7. Unit component location diagram (500 kVA, 50 Hz and 60 Hz, all voltages)
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Technical Data TD157003EN
Electronic voltage regulator (EVR)


Effective August 2015
Figure 8. 10–30 kVA heat sink layout
a
a Heat sink layout does not necessarily follow kVA size shown. Input voltage is also a factor in heat sink layout.
12
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Electronic voltage regulator (EVR)
Technical Data TD157003EN
Effective August 2015
Figure 9. 45–150 kVA heat sink layout
a
a Heat sink layout does not necessarily follow kVA size shown. Input voltage is also a factor in heat sink layout.
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Technical Data TD157003EN
Electronic voltage regulator (EVR)


Effective August 2015
Figure 10. 225–300 kVA heat sink layout
a
a Heat sink layout does not necessarily follow kVA size shown. Input voltage is also a factor in heat sink layout.
14
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Electronic voltage regulator (EVR)

Technical Data TD157003EN
Effective August 2015

Figure 11. 500 kVA heat sink layout
a
a Heat sink layout does not necessarily follow kVA size shown. Input voltage is also a factor in heat sink layout.
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Technical Data TD157003EN
Effective August 2015
Control board
Figure 12. Control board #49120/407415
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Electronic voltage regulator (EVR)


Electronic voltage regulator (EVR)

Technical Data TD157003EN
Effective August 2015

Technical diagrams
Figure 13. Generic circuit diagram—primary SCR—no bypass
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Technical Data TD157003EN
Effective August 2015
Figure 14. Generic circuit diagram—primary SCR—with bypass
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Electronic voltage regulator (EVR)


Electronic voltage regulator (EVR)

Technical Data TD157003EN
Effective August 2015

Figure 15. Generic circuit diagram—secondary SCR—no bypass
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Technical Data TD157003EN
Effective August 2015
Figure 16. Generic circuit diagram—secondary SCR—with bypass
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Electronic voltage regulator (EVR)


Electronic voltage regulator (EVR)
Technical Data TD157003EN
Effective August 2015
Figure 17. Installation diagram—EVR 10–15 kVA with optional bypass
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Technical Data TD157003EN
Effective August 2015
Figure 18. Installation diagram—EVR 10–30 kVA with optional meter and bypass
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Electronic voltage regulator (EVR)
Electronic voltage regulator (EVR)
Technical Data TD157003EN
Effective August 2015
Figure 19. Installation diagram—EVR 45K with optional meter and bypass
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Technical Data TD157003EN
Effective August 2015
Figure 20. Installation diagram—EVR 50K with bypass and optional meter
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Electronic voltage regulator (EVR)


Electronic voltage regulator (EVR)

Technical Data TD157003EN
Effective August 2015

Figure 21. Installation diagram—EVR 50K with bypass and optional meter (top and bottom view)
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Technical Data TD157003EN
Effective August 2015
Figure 22. Installation diagram—EVR 75–150K with bypass and optional meter
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Electronic voltage regulator (EVR)



Electronic voltage regulator (EVR)
Technical Data TD157003EN
Effective August 2015

Figure 23. Installation diagram—EVR 75–150K with bypass and optional meter (top and bottom view)
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Technical Data TD157003EN
Effective August 2015
Figure 24. Installation diagram—EVR 225–300K with bypass and optional meter
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Electronic voltage regulator (EVR)


Electronic voltage regulator (EVR)

Technical Data TD157003EN
Effective August 2015

Figure 25. Installation diagram—EVR 500K with bypass and optional meter
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Technical Data TD157003EN
Electronic voltage regulator (EVR)


Effective August 2015
Cabinet dimensions
Table 3. EVR unit cabinet sizes
Part number
kVA rating
Bypass
Optional
metering
Cabinet size
H x W x D inches
BTUs/Hr
Weight (Lb)
EVR010
EVR010
EVR015
EVR015
EVR025
EVR030
EVR045
EVR050
EVR075
EVR100
EVR125
EVR150
EVR225
EVR300
EVR500
10
10
15
15
25
30
45
50
75
100
125
150
225
300
500
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
30.2 x 22.2 x 29.0
44.2 x 22.2 x 29.0
30.2 x 22.2 x 29.0
44.2 x 22.2 x 29.0
44.2 x 22.2 x 29.0
44.2 x 22.2 x 29.0
44.3 x 45.9 x 29.0
66.0 x 29.0 x 35.5
76.0 x 34.4 x 35.5
76.0 x 34.4 x 35.5
76.0 x 34.4 x 35.5
76.0 x 34.4 x 35.5
77.4 x 56.0 x 41.5
77.4 x 56.0 x 41.5
77.0 x 72.4 x 48.4
1,025
1,205
1,540
1,540
2,560
3,090
4,600
7,332
9,514
11,833
14,748
17,698
23,000
30,750
51,250
440
520
465
700
700
720
950
1,176
1,575
2,014
2,137
2,240
3,300
4,000
5,500
Manual bypass switch
Standard monitoring
The manual bypass switch is a break-before-make switch located
on the EVR. The manual bypass switch is used to bypass all power
electronics in case of failure. Bypass is standard on 50 kVA and
larger units and an option on 45 kVA and smaller units.
Overtemp sensing devices are mounted at critical points on the SCR
regulating assembly and the main transformer. If an overtemp condition exists, the unit will electronically shut off; however, the cooling
fans will continue to operate. The “ALERT” light will illuminate and
hold until the overtemp is corrected. The main AC input breaker must
be turned off in order to reset the “ALERT” light.
NNote: This switch may be added in the field.
Alert light—An indicator light indicates if the output has been disabled by one of the following conditions:
Normal mode
With the switch in the normal position, the EVR will provide clean
and regulated power to the critical loads. The EVR should have the
switch in the normal position unless a failure has occurred.
These units are sold in accordance to Eaton Selling Policy 25-000.
(1) Transformer over-temperature
(2) SCR thermal over-temperature
Indicating lamps—Output ON indicating lamps are provided for
each phase.
Metering option
Bypass mode
With the switch in the bypass position, the EVR will provide clean
power to the critical loads. In the bypass position, the unit will not
regulate the incoming voltage. The transformer and suppression
circuitry remains in the circuit when in the bypass mode. The EVR
should be placed in the bypass position when a failure of the system
has occurred. This provides the user with some protection until a
service technician arrives.
CAUTION
Prior to switching from one position to another, turn off the AC
input breaker. Some systems are equipped with push-to-turn
switches. With these switches, the switch will shunt trip the
input breaker when pressed in.
The EVR offers two metering options. The IQ 130 meter is the
standard option on the EVR. The IQ 130 has programmable voltage,
current transformer ratios, and true rms indication for accurate
measurement of distorted waveforms, which can be viewed
through four screens via a high visibility LED display. Installation and
operation instructions for this meter can be found in Instructional
Leaflet IL02601002E. The premium metering option is the IQ 150—
which offers all the features of the IQ 130, along with energy, power,
communications ability, and many other enhanced features. Please
refer to Technical Data TD02601025E for additional information.
Warranty
Eaton warrants the EVR to be free from defects in
material and workmanship for a period of one year from the
shipment date. The warranty includes parts only during this time.
These units are sold in accordance to Eaton Selling Policy 25-000.
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Electronic voltage regulator (EVR)
Technical Data TD157003EN
Effective August 2015
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Technical Data TD157003EN
Effective August 2015
Electronic voltage regulator (EVR)


Eaton
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All Rights Reserved
Printed in USA
Publication No. TD157003EN / Z17060
August 2015
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of their respective owners.